ktvu's patti lee tells us who finally cracked the case for an elderly victim unable to fend for herself. >> reporter: 49-year-old marianita capra managed marin terrance that is until yesterday when police arrested her. >> we determined there was some odd financial transactions taking place and began investigation to see if there was criminal activity. >> reporter: capra targeted an 83-year-old woman who had no family but did have a financial advisor who reported a strange number of purchases that her client couldn't have made. >> the list compiled was in excess of $40,000 but it may be higher than that. >> reporter: police went through capra's home and removed ed. - - removed evidence. and are now looking into other evidence. >> we entrust those who are limited to what we consider responsible professionals. >> reporter: advocates for the elderly say better security is needed as well as better oversight. >> who's going to be watching? there should be some sort of checks and balances system in order to protect these people. >> reporter: the new administrator insists the residents are well